[11.14] Update `MergeRequests::all` to use millisecond precision

[janedbal]

We are iteratively fetching new MRs via:

updated_after=2023-01-24T18:05:25.801Z
&sort=asc
&order_by=updated_at

And there is more than 100 MR updated within a second. Current implementation causes the same MRs to be analysed again every time. But the API seems to support microsecond precision, so this should fix it.

[janedbal]

Adjusted the formatting:

• 2023-01-24T18:05:25.801Z works
• 2023-01-24T18:05:25.801+00:00 does not work

[GrahamCampbell]

This uses millisecond precision, not microsecond?

[janedbal]

Yes, adjusted title. GitLab API returns datetimes with milliseconds, not micro. So that is probably the best precision we can use.

[janedbal]

@GrahamCampbell any needed changes here?

[janedbal]

ping

[GrahamCampbell]

Thanks.